From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750719AbXCCXFj (ORCPT ); Sat, 3 Mar 2007 18:05:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750712AbXCCXFj (ORCPT ); Sat, 3 Mar 2007 18:05:39 -0500 Received: from moutng.kundenserver.de ([212.227.126.179]:49922 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750719AbXCCXFi convert rfc822-to-8bit (ORCPT ); Sat, 3 Mar 2007 18:05:38 -0500 From: Arnd Bergmann To: bert hubert Subject: Re: [PATCH -mm 1/5] Blackfin: blackfin architecture patch update Date: Sun, 4 Mar 2007 00:05:37 +0100 User-Agent: KMail/1.9.6 Cc: bryan.wu@analog.com, Andrew Morton , linux-kernel@vger.kernel.org References: <1172722480.5264.75.camel@roc-desktop> <200703032330.50116.arnd@arndb.de> <20070303225002.GB28961@outpost.ds9a.nl> In-Reply-To: <20070303225002.GB28961@outpost.ds9a.nl> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8BIT Content-Disposition: inline Message-Id: <200703040005.38189.arnd@arndb.de> X-Provags-ID: kundenserver.de abuse@kundenserver.de login:bf0b512fe2ff06b96d9695102898be39 X-Provags-ID2: V01U2FsdGVkX1/MgFKUI35l4Zu2REVGW4iiCiJa3wTTEoxoYU6 HeK7TfMnzQqbdPczuuFMFuCtxcP5OpBBSXoUE1Y8WXorsh560u MXgQR9Q2Bm34ulIxrJ7VQ== Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Saturday 03 March 2007 23:50:02 bert hubert wrote: > >       for (;;) > >               asm volatile ("idle"); > > This looks remarkably like relax_cpu() Actually not: cpu_relax() is defined as barrier(), it can't call idle because that might make it sleep for a indefinite amount of time (until the next interrupt, but only if they are enabled). Some nice architectures provide a hardware mechanism to do cpu_relax, like going to low-power mode for a few microseconds, but this one doesn't seem to have it. Arnd <><